ION ACCELERATION METHOD, ION ACCELERATION APPARATUS, ION BEAM IRRADIATION APPARATUS, AND ION BEAM IRRADIATION APPARATUS FOR MEDICAL USE

摘要

A laser light is emitted from a laser light source and focused inside a cluster-gas. A nozzle is installed in a vacuum. The nozzle is configured so that a jet of gas can be jetted from its top into the vacuum. The gas is a mixed gas of helium and carbon dioxide. The gas jetted into the vacuum undergoes adiabatic expansion with a steep cooling, which produces the cluster-gas. In the cluster gas, a large number of CO2 molecules aggregate into nanosized CO2 clusters which suspend in the gas of He atoms. It is preferred that the light focal point be located in a rear part of the cluster-gas. The most preferred are 80% to 100% positions of the orifice as seen from the front side.